Determination of POPs in environmental matrices – proficiency tests for Polish laboratories

2006 ◽  
Vol 11 (11) ◽  
pp. 584-589 ◽  
Author(s):  
Piotr Konieczka ◽  
Thomas P. J. Linsinger ◽  
Jacek Namieśnik
Keyword(s):  
Proficiency Tests ◽  
Environmental Matrices

Analytical Methodologies for the Determination of Cytostatic Compounds in Environmental Matrices

2020 ◽  
pp. 169-195 ◽  
Author(s):  
Sergio Santana-Viera ◽  
Sarah Montesdeoca-Esponda ◽  
Zoraida Sosa-Ferrera ◽  
José Juan Santana-Rodríguez
Keyword(s):  
Environmental Matrices ◽  
Cytostatic Compounds

scholarly journals The Determination of Six Ionophore Coccidiostats in Feed by Liquid Chromatography with Postcolumn Derivatisation and Spectrofotometric/Fluorescence Detection

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Małgorzata Olejnik ◽  
Piotr Jedziniak ◽  
Teresa Szprengier-Juszkiewicz
Keyword(s):  
Drug Resistance ◽  
Liquid Chromatography ◽  
Fluorescence Detection ◽  
Internal Standard ◽  
Reversed Phase ◽  
Feed Additives ◽  
Core Shell ◽  
Proficiency Tests ◽  
Reversed Phase Hplc

The control of levels of anticoccidial feed additives in targeted feeds plays an important role in the assurance of efficiency of animal treatment, prevention of drug resistance, and food safety. The robust and labour-efficient method for the simultaneous determination of six ionophore coccidiostats (lasalocid, maduramicin, monensin, narasin, salinomycin, and semduramicin) in targeted feed has been developed. Properly grinded and homogenized feed sample was spiked with internal standard (monesin methyl ester) and extracted with methanol. The extract was analysed with reversed phase HPLC without any further purification. The separation of the analytes with conventional C18 and core-shell columns was compared. Lasalocid was analysed with fluorescence detection, whereas other ionophores were detected with UV-Vis detector after derivatisation with vanillin in the presence of sulfuric acid. Fortified samples and targeted feeds at authorized levels were used for method validation. Recovery was in the range of 85–110%, depending on the analyte. The within-laboratory reproducibility did not exceed the target value from Horwitz equation. The results of the proficiency tests (z-scores in the range of −1.0 to 1.9) confirmed the reliability of the developed protocol.

scholarly journals Evaluation of Results of an Interlaboratory Comparison Test on Determination of Acrylamide in Crispbread Samples

2005 ◽  
Vol 88 (5) ◽  
pp. 1413-1418 ◽  
Author(s):  
Thomas Wenzl ◽  
Elke Anklam
Keyword(s):  
Standard Deviation ◽  
Proficiency Test ◽  
Interlaboratory Comparison ◽  
Research Centre ◽  
Proficiency Tests ◽  
Joint Research ◽  
Joint Research Centre ◽  
Analytical Results ◽  
Directorate General

Abstract The European Commission's Directorate General Joint Research Centre has organized several proficiency tests on the determination of acrylamide (AA) in food. This paper presents the results and outcome of a proficiency test that focused on the determination of AA in crispbread samples. One of the goals was the identification of the influence of different parameters such as analyte extraction or instrument calibration on the analytical results. A set of samples, containing 3 different crispbread samples as well as extracts of one crispbread sample and AA standard solutions, was shipped to each participant. A total of 42 European laboratories reported analytical results that were evaluated by applying internationally accepted protocols and procedures. The study found that, for each sample, the results of 4–8 laboratories were outside the range formed by the target value plus or minus the 2-fold of the target standard deviation; thus, they did not perform satisfactorily. In transferring this knowledge to the data of monitoring databases of AA in food, care must be taken that data are quality controlled, as it is likely that some of them may be biased.

Determination of 1,4-Dichlorobenzene in Environmental Matrices

2010 ◽  
Vol 71 (S1) ◽  
pp. 125-128
Author(s):  
Zoltan Juvancz ◽  
Rita Bodane-Kendrovics ◽  
Peter Beleznay ◽  
Istvan Erdelyi ◽  
Maria Klujber-Mohr
Keyword(s):  
Environmental Matrices

scholarly journals Development of an Improved Method of Sample Extraction and Quantitation of Multi-Mycotoxin in Feed by LC-MS/MS

Toxins ◽  
2020 ◽  
Vol 12 (7) ◽  
pp. 462 ◽  
Author(s):  
Bahar Nakhjavan ◽  
Nighat Sami Ahmed ◽  
Maryam Khosravifard
Keyword(s):  
Proficiency Tests ◽  
Improved Method ◽  
Salting Out ◽  
Modified Quechers ◽  
Sample Extraction ◽  
Z Scores ◽  
Safe Approach ◽  
Preparation Techniques ◽  
Validation Experiments

A multi-mycotoxin chromatographic method was developed and validated for the simultaneous quantitation of aflatoxins (AFB1, AFB2, AFG1 and AFG2), ochratoxin A (OTA), zearalenone (ZON), deoxynivalenol (DON), nivalenol (NIV), diacetoxyscirpenol (DAS), fumonisins (FB1, FB2 and FB3), T-2 toxin (T-2) and HT-2 toxin (HT-2) in feed. The three most popular sample preparation techniques for determination of mycotoxins have been evaluated, and the method with highest recoveries was selected and optimized. This modified QuEChERS (quick, easy, cheap, effective, rugged and safe) approach was based on the extraction with acetonitrile, salting-out and cleanup with lipid removal. A reconstitution process in methanol/water was used to improve the MS responses and then the extracts were analyzed by LC-MS/MS. In this method, the recovery range is 70–100% for DON, DAS, FB1, FB2, FB3, HT-2, T-2, OTA, ZON, AFG1, AFG2, AFB1 and AFB2 and 55% for NIV in the spike range of 2–80 µg/kg. Method robustness was determined with acceptable z-scores in proficiency tests and validation experiments.

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